SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86186cf9556592eb036c4466877eadf617210a43f32e006524c83c1bbd48674d' 
  AND token = 'vJiCMOwMTsOGcLNr/vf9C+KrQbOb/1Ua8Vfx8Ruotl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}